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Greetings. Today I discovered the world of theming Firefox through something called CSS. I went to the store page, and I wanted to add the Opera GX theme. Therefore, I first enabled the legacy toolkit config in the about:config page. Then, I went to the UserChrome.css file found on github for that theme and copied the raw data. Here is where things get interesting. I went to the about:profiles page and tried to open the root directory of the default profile, and it failed to open. I then tried searching for the directory in the file manager, it does not exist. No, it’s not hidden, it does not exist! The local directory, however, does exist, so I opened it and made the chrome folder and subsequently the userChrome.css file by using the text editor. I then restarted firefox, and…nothing happened. I cleared my browsing data and disabled all my of extensions, still nothing. I then had the idea of creating the root directory myself, so I created the necessary folders in the correct locations according to the about: profiles page, and then I moved the contents of the local directory to the root directory, and then restarted firefox. And…nothing happened. I was scratching my head at the point, so I tried searching the web to see if anyone else had a similar problem to mine, but I didn’t find anything relevant to my problem. Has anyone encountered a similar problem to mine? Is there anything that I’m missing? My OS is Ubuntu 23.04 and I’m using Firefox 115.0.2 (flatpak). I posted my problem on the Firefox CSS community, but the problem with it is that it's not active, so I hope the mods don't mind my post here. Any help would be appreciated.

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[-] josephsh98@lemmy.kde.social 1 points 1 year ago

Thank you guys. Other than giving Firefox permission to access the root folder, it turns out there was more to do in order to get OperaGX theme to work, like enabling a few more config settings, and copying the entire chrome folder and user.js file from the source.

this post was submitted on 14 Jul 2023
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